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Aug. 14, 1956 c, pARKER r 2,758,785

DIFFERENTIAL ACTUATING AND PRINTING MECHANISM FOR AN ACCOUNTING MACHINEFiled May 25, 1951 7 Sheets-Sheet 1 g7 WTOR?! w z waw Z ATTORNEYS l I iI I Q BY Aug. 14, 1956 c. A. PARKER ETAL 2,758,785

DIFFERENTIAL ACTUATING AND PRINTING MECHANISM FOR AN ACCOUNTING MACHINEFiled May 25. 1951 7 Sheets-Sheet 2 IN VEN TORS ATTORNEYS.

Aug. 14, 1956 c. A. PARKER ETAL DIFFERENTIAL ACTUATING AND PRINTINGMECHANISM FOR AN ACCOUNTING MACHINE 7 Sheets-Sheet 3 Filed May 25, 1951INVENTORS.

A TTURNFYS Aug. 14, 1956 c. A. PARKER ETAL 2,758,785

DIFFERENTIAL ACTUATING AND PRINTING v MECHANISM FOR AN ACCOUNTINGMACHINE Filed May 25, 1951 7 Sheets-Sheet 4 ATTORNEYS.

Aug. 14, 1956 c. A. PARKER ET AL DIFFERENTIAL ACTUATING AND PRINTINGMECHANISM FOR AN ACCOUNTING MACHINE 7 Sheets-Sheet 5 Filed May 25, 1951INVENTORS.

x) L i ATTORNEYS.

Aug- 14. 1956 c. A. PARKER ET AL 2,753,785

DIFFERENTIAL ACTUATING AND PRINTING MECHANISM FOR AN ACCOUNTING MACHINEFiled May 25, 1951 7 Shets-Sheet 6 ATTORNEYS;

14, 1956 c. A. PARKER ETAL 2,753,735

DIFFERENTIAL ACTUATING AND PRINTING MECHANISM FOR AN ACCOUNTING MACHINEFiled May 25, 1951 7 Sheets-Sheet '7 INVENTORS, (ll flan A. fiqiney[bar/Rs x9. Par/fer United States Patent DIFFERENTIAL ACTUATING ANDPRINTING MECHANISM FOR AN ACCOUNTING MA- CHINE Charles A. Parker,Knoxville, Tenn., and Clifton K. Rainey, Chicago, 111., assignors, bymesne assignments, to Burroughs Corporation, a corporation of MichiganApplication May 25, 1951, Serial No. 228,274

'28 Claims. (Cl. 235-6028) This invention relates to accountingmachines. It provides a single machine operative under selective controlto function as either a typing machine, a posting machine, or acalculating machine, in which all typing and all calculator indexingoperations are governed from a common, single keyboard. Incidental tothe performance of its various functions, the machine embodies the usualmanual and automatic controls of known typewriting, post ing, andcalculating machines; and additionally includes novel manual as well asautomatic controls for conditioning the machine, at the will of anoperator, either to carry out or to exclude, during the performance ofone of its functions, the performance of all or part of its otherfunctions.

This application is a continuation-in-part of our copending applicationSerial No. 99,081, filed on June 14, 1949, now Patent No. 2,696,945, andrelates to a further improvement in accounting machines of the typedefined in Patent No. 2,496,357 which issued on February 7, 1950, onapplication which was copending with the above.

A further object is to provide an accounting machine having calculatingmechanism including actuators paired with corresponding adding typecarriers, in which the actuator and type carrier in each pair haveindependent and relative movement in the operation of the machine.

Another object is to provide an accounting machine having calculatingmechanism including actuators and a cycling operating member therefor,wherein the actuators operate under spring tension derived from theoperating member in the course of its cycle movement.

Still another object is to provide an accounting machine having addingtype carriers movable into and out of printing position relative to aplaten, and a cycling operating member, wherein the type carriers aremoved under spring tension derived from the operating member in thecourse of its cycle movement.

A further object is to provide an accounting machine having a visiblefront strike typing machine and adding type printing means operativefrom the same keys on a single keyboard common to both to print at aprinting point common to both.

A still further object is to provide in an accounting machine havingadding type carriers movable into and out of printing position and asingle hammer common to a plurality of the carriers, means for holdingout of printing position all adding type carriers to the left of thosecomprising an item to be printed.

Other objects will be apparent to those skilled in the art.

In the accompanying drawings:

Figure l is a top plan view of the machine;

Figure 2 is a side elevation with the front part of the main frameremoved for illustration of detail;

Figure 3 is a horizontal section substantially on the line 3-3 of Figure1;

Figure 4 is a vertical section substantially on the line 4-4 of Figurel;

Patented Aug. 14, 1956 Figure 5 is a vertical section substantially onthe line 55 of Figure l;

Figure 6 is a bottom plan view of levers and associated parts;

Figure 7 is an end view on the line 77 of Figure 6;

Figure 8 is a perspective view of latch fingers employed in connectionwith the adding type bar operation;

Figure 9 is a fragmentary view showing a modification in the structureshown in Figures 4 and 5; and

Figure 10 is a top plan view through an interior portion of the'machine.

As indicated generally in Figures 1 and 2, the apparatus essential-1ycomprises a main frame 40 of the general form and structure of atypewriter frame; being provided with a keyboard and having a carriageassembly C mounted on the frame for reciprocation in the usual manner oftypewriter and posting machine carriage operation.

The machine is equipped with a bank of front strike type bars 41operated from keys 42 for front strike visible printing at a pointdetermined by a type guide 43 which forms part of a hammer member 44that operates in a manner later described to effect a common strikingmovement against a properly positioned series of adding type bars whenthey are disposed for printing. The keyboard has the usual spacer 45and, at the right hand side of the frame, a motor bar 46. On the lefthand side of the frame is disposed a tabulator bar 47. The front plateof the frame mounts keys for controlling the functions of calculatingmechanism generally indicated at A. These keys at the right hand side ofthe frame comprise an adding key 48, a total key 49, a subtotal key 50and, at the left hand side of the frame, a subtract key 51. The typeguide 43 establishes the printing point and establishes also the decimalpoint for item printing in the calculating machine operation. Thecarriage is provided at its left hand end with a forwardly directedreturn handle 52 which is substantially of conventional design and whichmay be rotated to effect line spacing in the usual manner of suchdevices.

An essential part of the machine is embodied in a driven reciprocableelement which operates through a defined cycle between limit positionsin one of which it is at rest, under the influence of motor means toaccomplish many functions and to effect the positioning and actuation ofthe various members and instrumentalities by which the differentoperations of the associated mechanisms are carried out. This member,herein referred to as an operating frame generally designated at 0,provides for the actuation of the various instrumentalities after themachine has been conditioned for their proper sequential operation. Itis an important aspect of this invention that, for the greater part, theoperation of the various levers, detents, and actuators is under theinfluence of springs, whereby the various elements are biased or urgedinto operating movement that is normally restrained by the withholdingaction of other elements movable under the influence of the operatingframe to permit operation of the various levers, detents, and actuatorsunder the influence of their springs. This relieves the motor of a veryconsiderable load, and not only assures fast, smooth operation of themachine but also eliminates to a major extent any possibility ofbreakage in the event of jamming. Should something occur to jam anyparts of the mechanism, the affected parts will not be moved under aforce greater than that exerted by their associated springs.

Printing control from calculating unit The calculating unit, generallyindicated as at A in Figure 1, embodies a plurality of conventionalcalculator actuators, here shown as slides 142, one for each digit ofthe calculating unit, which reciprocate horizontally in a framestructure 143 that extends rearwardly from the rear end of the mainframe 40 on the base plate 112,

The frame 143 is so positioned relative to the general assembly that theprinting point at the type guide 43 is disposed substantially betweenthe second and third digits of the adding type bar assembly.

Each actuator of the calculating unit is provided with an abutment 144positioned rearwardly of the stop pin box assembly for engagement by oneof the stop pins 132, when positioned, so that forward movement of theactuator is arrested at the proper point determined by the numeral key.Common in the operation of adding machines generally, the zeros of theadding type bars all are brought to striking position at the start of aprinting operation. in the machine of this invention the adding typebars are held against movement to striking position until the calculatoractuators have moved beyond their zero position. Because of the factthat in the present machine a plurality of adding type bars are strucksimultaneously by a hammer common thereto, means is necessary to preventprinting of zeros to the left of items printed by impact of the hammer.In machines in which the adding type bars are struck by individualhammers the withholding of type bars to the left is not necessarybecause those bars are not struck except when the appropriate hammer isactuated.

The machine incorporates in its stop pin box assembly the usual slideplate 145 between the stops 144 and shoulders 146 on the calculatorslides. it is activated in the conventional manner from the stop box lug147 which pivots the slide at 148.

A highly important feature of the invention is the flexible control ofthe adding type bar action from actuators of the calculating unit. Atthe start of a printing operation, the actuators move through a part oftheir travel independently of any operation of the adding type bars. Ata predetermined point in the line of travel those actuators permitted tomove beyond zero position engage and release spring biased latch meansnormally holding the adding type bars anchored against movement tostriking position. This release is effective only as to the type barsassociated with those calculator actuators which have moved beyond theirzero position. All others are held against movement except the type barsto the right of any actuator that has gone beyond zero position. Actualmovement of the released type bars to striking position is effected bymeans movable in response to a bias derived from movement of theoperating frame.

Movement of the calculator actuators derives from that of the operatingframe and is initiated through a spring bias that becomes effective uponthe release of restraining means. bodied in an actuator restore bar,later described, is movable to release position by propulsion from theoperating frame at a predetermined point in one direction of its travel.Propulsion of the restraining means acts against the tension of springmeans biasing the restraining means to operative position. The bias ofthe spring means which urges the restraining means to operative positionis utilized to return the adding type bars from printing position duringmovement of the operating frame in an opposite direction, jointly withrestoration of the calculator actuators to initial position. Therestraining means in moving back to its operative position acts throughthe calculator actuators to return the adding type bars toward theirinitial latched position. Modulating means operative from therestraining means acts at the same time on the type bar moving :means toaccelerate the movement of the adding type bar's relative to that of thecalculator actuators so that, when the operating frame comes to rest,the calculator actuators will be out of engagement with the adding typebar moving means, and the type bar moving means will again be latched tohold the type bars at the extreme limit of their travel out of printingposition.

Each adding type bar comprises a shank 149 that is vertically slidablefor reciprocation in the adding type The restraining means, herein em- Mbar frame 89, which includes a front plate and rearwardly extended sideplates 15%. Within the adding type bar frame there are disposed aplurality of followers 151 each of which receives in camming engagementthe forward disk-shaped terminal 152 of its associated moving means 153,here shown as a bell crank actuator. One such actuator is provided foreach adding type bar. It comprises a bell crank lever having arelatively long forward arm 154 and a shorter rear arm 155. Therespective bell crank actuators 153 are pivotally supported from a shaft156 that is mounted transversely in the frame 143. The arrangement ofhell crank actuators, adding type bars, and followers, is substantiallythat as shown in Patent No. 2,496,357, to Clifton King Rainey ofFebruary 7, 1950. The function of each hell crank actuator 153 is toshift its adding type bar it?) into and out of platen striking position.Normally, during index operation of the numeral keys, all adding typebars are in their lowermost position with their bell crank actuators 153latched in the position indicated in Figures 4 and 5. In this positionof the parts the lift arms 1254 of the actuators 153 are all held downby a transverrc yoke 157 that straddles the upper edges of. the cranklever arms. At each end the yoke 157 has fixed connection with asubstantially triangular plate 158 that is pivoted at its apex portionon the shaft 156. The plates 158 with the attached holding down yoke areurged to move in a clockwise direction through the agency of a pull rod159 that is pivotally connected at its forward end to the lower endportion of the triangular plate and which at its rear end has axiallyslidable connection with an element of the restore bar Mil, later to bedescribed. The rear ends of the rods 159 extend rearwardly beyond therestore bar and are provided with take-up adjusting means comprisingnuts 161 threaded on the ends of each bar and bearing against a spacersleeve 162 that contacts the restore bar, so that rearward movement ofthe bar is transmitted to the pull rods 159 for pull down movement ofthe plates 158 and hold down yoke 157. The triangular-shaped plates 158are normally urged to move counterclockwise through the medium of alight spring 163 that is connected to one of the plates and to a fingerbracket mounted in an element of main frame.

After the adding type bars have been indexed by opera tion of thenumeral keys, as previously described, the items provided by theindexing ready for printing. This printing operation is accomplishedduring the cycling operation of .a member mounted for reciprocation inthe main frame and which transmits the n e rv operating; movement to theparts. This member, is operating frame 0, consists of parall side plright hand side plate R and a left t are spaced apart and connected as arigid unit. versely extended front bar M2 and a tran'svr rear bar 16h.This frame is rccipr-ocated hO..i.O11ltlly in the main, frame betweenits limit positions in operation under the influence of an ole. clutchmechanism indicated generally at and clutch assembly is secured to themain f ably on the left hand side thereof, d when the actuated bydepression of the keyboard z'notor functions to impart rotation main dis journalled transversely of the main r ,1 sides thereof. The driveshaft .163 is rota e'n'd extensions to which are secured, on their innerf vertically disposed heads 165 each of which is for with a verticalclosed end slot This slot is intersected intermediate its ends by a hor'ontal slot .171 that is 'c'lose'd'at its rear end and open at its fort 3end into the vertical slot. The vertical slot constitutes a gnideway foracross head 172 which mounts a. laterally extending stud 173 connectedto a crank 174 secured to and rotatable with the driving shaft 163. Withreference particularly to Figme 3, it will be seen that as the mainshaft 168 is rotated, the crank 174 through its cross head 172 acts tomove the operating frame 0 horizontally forward relative to the front ofthe machine through one half its operating cycle, and to move the framehorizontally rearward through the other half of its operating cycle.

With the parts in the position illustrated in Figures 3, 4 and 5, theoperating frame 0 is at its rearmost limit and is in position for theinitiation of an operating cycle. The front cross bar 165 of the framehas secured thereto a forwardly projected plate 175 that has a portion176 inclined upwardly and forwardly to merge with a forwardly andhorizontally directed lip 177 which at its forward end is formed with anintegral upstanding car 178. A separate retracting spring 179 isconnected between the ear 178 and the short arm 155 of each bell crankactuator 153. The bias of this spring is such that as the operatingframe moves forwardly during the first half of its cycle the spring istensioned to bias the actuator 153 for rotation on its pivot in adirection clockwise with respect to Figures 4 and 5. Rocking movement ofthe bell crank actuator for each adding type bar is normally preventedby latch means 188. In this embodiment of the invention this latch meanscomprises, for each adding type bar actuator 153, a thin planar fingerthat is flat in a vertical plane and which underlies its associatedactuator 153 in vertical registry therewith. Each finger 180 ispivotally mounted at its rear end on a bearing shaft 181 that issupported at each end in a mounting bracket 182 which is in turn fixedto the adjacent side plate of the calculating unit frame 143. The shaft181 extends transversely between the sides of the frame 143 and occupiesa position slightly forward of the rear edge of the bracket 182. Eachfinger normally is urged upwardly to rock clockwise on its pivot, withrespect to Figures 4 and 5, through the bias of a spring 183 that isconnected at one end to a transverse mounting bar 184 extending betweenand positioned in the brackets 182 beneath the bank of fingers. Eachspring 183 at its other and rear end is connected to an car 185 thatdepends from the rear end portion of its finger 180. Upward rockingmovement of each finger has a limit position that is determined by theengagement of its fiat upper edge against the bottom of a thinhorizontal plate 186 that overrides the bank of fingers and which issecured at its ends in the brackets 182. Forwardly of the plate 186,which functions as a stop member, each finger 180 carries an upstandingdetent 187 that is substantially triangular-shaped to provide an apexportion engageable in a complemental receiving socket 188 formed in theperiphery of a disk-like cam head 189 on the lower end of the short arm155 of the bell crank actuator. The apex portion of the detent 187 isinclined slightly rearwardly so that it functions, when engaged in thesocket 188 of the bell crank actuator, as a positive latch which holdsthe bell crank actuator against movement on its pivot shaft 156. As bestshown in Figure 4, in this normal position of the parts the head 189 ofthe bell crank actuator arm 155 is disposed slightly to the rear of avertical shoulder 190 constituting the rear vertical edge of an insert191 that is secured between the front ends of a pair of horizontallyextended parallel side pieces 192 which, at their rear ends, are securedto the opposite side faces of a forward extension 193 of the associatedcalculator actuator slide 142. The side members 192 provide between thema guideway for the diskshaped head 189 of the bell crank actuator arm155, so that there is no possibility of side sway during the operationof the bell crank actuator. These side members also provide a guidewhich confines movement of the finger detent 187 to a true verticalplane for cooperation with the actuator head 189.

The insert 191 at the front end of the side members 192 is provided witha forwardly directed ear to which is attached one end of a coilretracting spring 194 that is connected at its outer and forward end tothe upstanding bar 178 of the plate 175 fixed to the front bar 165 ofthe 6 reciprocable operating frame 0. Normally, prior to the start of acycling operation, the springs 179 and 194 are only slightly undertension. As the operating frame moves forwardly through the first halfof its cycle these springs are placed under increasing tension. Thetension on the springs 194 acts to pull forwardly, in the case of eachspring, its associated calculator slide 142 until forward movement ofthe slide is arrested by the holding action of any of the differentinstrumentalities which may come into play to arrest forward movement ofthe slide at a proper point. One such arresting means may be a stop pin132 set in the stop pin box by operation of the indexing means. Anothersuch arresting means may be that which is inherent to the operation ofthe slides in connection with their associated rack mechanisms forming apart of the calculator mechanism.

When any calculator slide 142 is arrested during the course of itsforward movement the continued independent forward movement of theoperating frame then increases the tension on the associated spring 194until the operating frame has reached the forward limit of its travel.In the case of those slides permitted movement beyond zero position byany of the different types of arresting means, that is, slides whichfunction in the operation of printing an item, forward movement willcontinue under the pull of the springs 194 until the leading bottom edgeof the appropriate insert 191 rides upon and cams downwardly theinclined upper edge 195 of an upstanding head 196 on the front end ofeach finger 180. As the camming action continues, the appropriate finger180 will be depressed sufficiently to disengage its detent 187 from theassociated socket 188 of the adding type bar actuator 153, whereupon,under the tension of the spring 179, the actuator will be rocked on itspivot to move the head 189 of its short arm into contact with the rearvertical edge of the insert 191. Forward movement of the slide under theinfluence of its associated spring 194 continues to the point at whichthe movement of the slide is arrested by any of the arresting meanspreviously described. When in finally arrested position, the slide is sodisposed that its paired actuator 153 will have been rotatedsufiiciently on its pivotal support to elevate the cam head 152 of itslong arm 154 to lift its associated adding type bar to its strikingelevation for printing.

Particularly with reference to Figures 6, 7 and 8, it will be noted thateach finger 180, except that at the extreme left hand of the bank offingers, is provided with a laterally directed integral plate lug 197which immediately underlies the next adjacent finger of the series inthe direction to the left, as viewed with respect to Figure 7. The platelugs 197 are staggered on their respective fingers, as shown in Figure6, so that there will be no interference in their operation. By reasonof this construction it will be apparent that when any finger of theseries to the left of the right hand finger, viewed with respect toFigure 7, is depressed, it will in turn, through the chain of plate lugson the other fingers, carry down with it all fingers to its right, sothat their associated slides 142 may function by movement to theirappropriate positions.

Add type bar printing mechanism During forward movement of the operatingframe 0 in the first half of its cycle, the main shaft 168 operatingfrom the motor and clutch assembly, will have correspondingly rotated apair of snail cams 198 afiixed to the shaft for rotation therewith. Thelocation of these cams is such that they are engaged with the forwardedge portions of the hammer carrier levers 199 at their lower endportions. These hammer carrier levers 199, and the associated partswhich function in the striking movement of the hammer and type bars inthe printing operation, are disclosed in detail in Patent No. 2,496,357of February 7, 1950. Briefly described, this mechanism includes a pairof the hammer carrier levers 199, each 7 of which is pivotedintermediate its ends for oscillation in a vertical plane in theprinting barmounting frame 150. At their upper ends the levers 199 areconnected by the transversely extended hammer 44 which carries the typeguide 43. The lower ends of the hammer levers are biased to move in adirection which imparts striking action to the hammer by the tension ofcoil spring means 2% connected between a point on the main frame and theintermediate portion of a cross bar 201 carried by and between the lowerends of the hammer levers. As the cams 198 arrive in proper position,their high points 202 slip past a shoulder 203 on the forward edge ofeach hammer lever and trigger the hammer levers for snap movement in astriking action under the influence of the spring means 200. of thehammer cannot take place until the adding type bars have been positionedfor printing action under the influence of their respective bell crankactuators 153.

One complete operating cycle of the frame '0 is eifected simultaneouslywith one complete revolution of the main shaft 168.

In consequence, when the high point 202 of each cam returns to itsinitial position, as shown in Figures 4 and 5, a diametrically opposeddwell portion The restore bar With reference particularly to Figures 3,4 and 5, it will be seen that the restore bar 160 is mounted forreciprocation forwardly and rearwardly in the assembly and is carried bythe operating frame. The bar 16 8 extends transversely between the sideplates of the operating frame and is supported slidably on the upperedges thereof by attached saddle blocks 450 which straddle the upperedges of the sides of the operating frame. The restore bar isrectangular in cross section and is attached in brackets 451 providedwith re-arwardly directed portions which form connecting points for abank of springs 452 that extend rearwardly from the brackets 451 toanchor brackets 453 attached to uprights 454 secured to the operatingframe at its rear end. The restore bar and operating frame arerelatively movable. Normally, the restore bar is retained at its rearlimit of travel by adjustable stops 455 that are mounted in thedownturned rear ends of brackets 456 which extend forwardly in theassembly and which are anchored at their forward ends to an element ofthe main frame. Adjustment of the stops 455 determines the rearmostlimit of movement of the restore bar. The side edge plates of theoperating frame are formed at their upperedges each with a shoulder 457that is spaced rearwardly with respect to the restore bar when theoperating frame is at its rear limit of travel, as best shown in Figure5. When the operating frame is in a position of rest at its rearmostlimit of travel the banks of springs 452 are under tension normallyurging the restore bar and rearend of the frame into relative convergingmovement that is prevented by engagement of the restore bar against thestops 455. When the operating frame starts forward in the first half ofits cycle the tension of springs 452 acts to pull the frame forwardlywith an initial force that is already in effect before the frame beginsto move under the influence of the motor drive shaft 168. This biasmaterially assists the motor in picking up its operating speed at thestart of the operating frame cycle.

The bias of the springs 452 is effective until the operating frameadvances forwardly to the point at which its shoulders 457 engage therear of the restore bar, after which the bar is carried forwardly withthe operating frame under positive movement thereby. During the intervalrequired for the operating 'frameshoulders 457 This striking action'sion. which function to move the calculating unit actuator to engageand begin to move the restore bar, the advance o'fthe frame places thesprings 1'79 and 194 under ten- These are the springs, shown in Figures4and 5,

slides 142 and the adding type bar actuators 153 forwardly in theiractuation. Tension on the springs 194 operates through the slideextensions to pull the slides E42 forwardly until their leading edgeportions contact the rear edge of the restore .bar. At this pointfurther forward movement of the slides 142 is at the rate of movement ofthe operating frame for those slides which are permitted to move forwarAfter the completion ofindexing and when the operating frame begins tomove rearwardly throughthe second half of its cycle the springs 452again are brought under .bar lift actuators 153 are returned to theirdepressed initial position. As previously described in connection withthe operation of the calculator slides in the indexing function,theposition of rest reached by the actuators 153 when depressed underrearward pull of the yoke lid! is such that the short arms 155 of theactuator bar cranks are disposed rearwardly in spaced relation withrespect to the inserts 191 of the extensions of the slides 142, wherebythe adding type bars are held in fully retracted position.

Thus the restore bare 16% in moving rearwardly contacts and returns theslides 14-2 to their normal restored position whereby they are helduntil the following cycle of operation. The restore bar has downwardlyextending brackets containing slots through which each of the rods 159freely pass. During return movement of the restore bar, these bracketsengage spacer sleeves 3.62

secured to rods by nuts 1 .61 and actuate the rods rearwardly. The rodsare pivotally fastened to plates 158 so that the plates rock on theirpivots 156 and swing yoke 1'57, attached to plates 15o, in an action tomove the type bars over a greater range than that which would resultfrom the movement of their corresponding actuators. The movementresulting from the combination of elements 15'1", 158 and 1539 bringsactuators 153 to a position where the cam head 718 is moved beyondshoulder 1% of element 1%.

The restore bar lihii has pivotal connection 458 at its left end withits associated saddle block 45% and at its other end is longitudinallyslotted to receive slid-ably the shank of an upstanding securing element459 carried by the subjacent saddle block 456*. By this arrangement therestore bar is permitted a limited rocking movement on its pivot to theextent determined by limits of the slot in its opposite end. Theadvantage of this arrangement is that, should an obstruction occurduring the restoring operation while the calculator slides are movingrearwardly, the restoring bar bearing on the leading edge of a stuckslide would apply no force beyond that of the limit'of the springs 452.The stuck slide would become, in effect, a fulcrum point on which therestore bar would rock to permit self-alignment of the sliding saddleblock 454 Not infrequently, in the normal operation of the machine, itis desirable to cite; a calculatingstroke or other stroke of the machinewithout raising the type bars 149 to printing position. For thispurpose, it is expedient to provide a separate arresting means 5%adapted to be operated independently of the actuating mechanism, as by akey or other typing instrumentality located iiiithe carriage or incooperative relation therewith for operation of the latching mechanismin response to a predetermined setting of the machine.

An arresting means of the type described, illustrated in Figure 9,comprises an L-shaped lever 501 having a short arm 502 extendingupwardly through an opening 503 in the frame plate 59 in position to beoperatively engaged by a control instrumentality or the like. The leveris pivoted between the ends of a horizontally disposed long arm 504 upona pin 595 extending laterally from an upright stud 506 fixed to theframe. The forward end portion 507 of the arm 504 is inclined downwardlyto engage a notched portion 508 formed in the upper downwardly inclinededge portion of the triangular plate 155 at a point forwardly of theshaft 156 upon which it is pivoted.

The lever arm is constantly urged to turn in the counter-clockwisedirection about its pivot to engage the end portion 507 within the notch508 by a coil spring 599 anchored at one end onto the underside of theplate 59 and at the other end through an opening or onto a pin 510located in the arm 504 to the right of its pivot. When the uprightportion 502 is depressed to rock the lever arm in the clockwisedirection about its pivot, the end portion 507 is displaced fromoperative engagement within notch 508 to release the bell crank actuator153 for normal operation.

It is to be understood that the present disclosure is illustrative andnot restricted, in that the invention may be practiced in any formconsistent with its scope as claimed.

We claim:

1. In an accounting machine, a main frame, a platen, adding type barsmovable to and from printing position relative to the platen,calculating mechanism including actuators corresponding to the addingtype bars, an operating member movable in the frame, spring tensionmeans connecting individual type bars and the operating member, holdingmeans carried by the main frame and biased to position preventingmovement of said type bars to printing position, spring tension meansconnecting individual actuators and the operating member, said type barsand their corresponding calculating actuators being independently andrelatively movable with and by the operating member through their springtension connections, and said calculating actuators acting when movedbeyond their zero positions to disable said holding means whereby torelease the type bars for movement to printing position.

2. In an accounting machine, a main frame, a platen, adding type barsmovable to and from printing position relative to the platen, anactuator for each type bar comprising a bell crank lever fulcrumed inthe frame with one arm in operating connection with its type bar, anoperating member reciprocable in the frame, calculating mechanismincluding an actuator slide corresponding to each type bar actuator,each slide having a portion adjacent the other arm of its correspondingbell crank lever, said other arm having a terminal cam, an abutment onthe calculating slide in the path of movement of the cam, spring meansconnecting each slide with the operating member and biasing the slidesto move with the operating member in one direction of its travel, springmeans connecting the cam arm of each bell crank lever with the operatingmember and biasing the levers to rock with movement of the operatingmember in said one direction of its travel to move the type bars toprinting position, latch means normally engaged with the bell cranklevers to hold their cams spaced from the calculating slide abutmentswith the type bars positioned at the extreme limit of their travel outof printing position, latch release means on each calculating slideoperative when the slide moves beyond its zero position to free theassociated bell crank lever for movement of its cam into contact withthe slide abutment whereby to determine the extent of printing positionmovement of the corresponding type bar, means operative upon movement ofthe operating member in the opposite direction to return the calculatingslides to initial position, and said return means having an operatingconnection with the bell crank levers whereby, on return of thecalculating slides to initial position, the levers are rocked to carrytheir cams out of contact with the slide abutments for movement of thetype bars to the extreme limit of their travel out of printing positionfor reengagement of the latch means.

3. In an accounting machine having calculating mechanism includingactuators, an operating member for said mechanism movable through a fullcycle between limit positions in one of which it is at rest, springmeans urging said actuators to move independently of and in thedirection of travel of the operating member during the first half of itscycle, restraining means on said operating member and movable relativethereto in engagement with the actuators to hold them against suchmovement during an initial portion of the first half cycle travel of theoperating member, spring means biasing the restraining means tooperative restraining position, and release means on said operatingmember operative after an interval of initial travel thereof to engageand move said restraining means with the operating member during theremainder of its first half cycle.

4. In an accounting machine having calculating mechanism includingactuators, an operating member for said mechanism movable through a fullcycle between limit positions in one of which it is at rest, springmeans urging said actuators to move independently of and in thedirection of travel of the operating member during its first half cycle,restraining means on the operating member and movable relative theretoin engagement with the actuators to hold them against such movementduring an initial portion of the first half cycle travel of theoperating member, spring means biasing the restraining means tooperative restraining position, release means on said operating memberengageable with the restraining means after an interval of initialtravel of the operating member to carry the restraining means with andin the direction of travel of the operating member during the remainderof its first half cycle, and said restraining means under the pull ofits spring bias engaging and restoring to initial position thecalculating actuators during travel of the operating member in itssecond half cycle.

5. The structure of claim 4, and means for arresting return movement ofthe restraining means at its initial point of operative engagement withsaid actuators.

6. In an accounting machine having a platen and calculating mechanismincluding actuators paired with corresponding adding type carriers, anoperating memher for the calculating mechanism movable through a fullcycle between limit positions in one of which it is at rest, means formoving the type carriers into printing position relative to the platen,latch means normally engaged with each type carrier moving means to holdits type carrier at the extreme limit of its travel out of printingposition, spring means urging said actuators to move beyond zeroposition independently of and in the direction of travel of theoperating member during its first half cycle, restraining means on theoperating member and movable relative thereto in engagement with theactuators to hold them against such movement during an initial portionof the first half cycle travel of the operating member, spring meansbiasing the restraining means to operative restraining position, meansoperative to condition certain actuators for movement beyond zeroposition, means on said operating member effective, after movementthereof beyond said initial portion of its first half cycle travel, toengage and move the restraining means with and in the direction oftravel of the operating member during the remainder of its first halfcycle whereby to release those actuators conditioned for movement beyondzero position, said actuators when 11 moving beyond zero positionengaging and releasing their respective type carrier latch means, saidrestraining means moving, during the second half cycle of the operatingmember, under the pull of its spring bias to engage and carry back allactuators disposed beyond zero position, means for arresting returnmovement of the restraining means at its initial point of engagementwith all said calculating actuators, and means in operative connectionwith said restraining means for moving back to initial latched positionall type carrier moving means freed by movement of their correspondingcalculating actuators beyond zero position.

7. In an accounting machine having a platen, type bars movable to andfrom printing position relative to said platen and actuators for eachtype bar shiftable during each cycle of operation to and from positionsdetermined by calculating pinions and stops set by the typinginstrumentalities, lever means operatively connected to said type barsfor actuating same to and from printing position, means forming a partof said actuator for controlling movement of said lever means whilepermitting limited relative movement therebetween, means independent ofsaid actuator for latching said lever means against movement to printingposition, means on said actuator for inactivating said latching meansduring a portion of said relative movement of said actuator to releasesaid lever for movement to printing positions controlled by saidactuator, and means urging said levers in the direction to raise thetype bar to printing position.

8. In an accounting machine having a platen and typinginstrumentalities, type bars movable to and from printing positionrelative to said platen and actuators for each type bar shiftable duringeach cycle of operation to and from positions determined by calculatingpinions and stops set by the typing instrumentalities, lever meansoperatively connected to said type bars for actuating same to and fromprinting position, means forming a part or" said actuator forcontrolling movement of said lever means while permitting limitedrelative movement therebetween, means independent of said actuator forlatching said lever means against movement, means on said actuator forinactivating said latching means during a portion of said relativemovement of. said actuator to release said lever for movement topositions controlled by said actuator, and means forming a part of saidlatching means for automatically releasing all latching mechanism to oneside thereof to release their corresponding levers for movement topositions controlled by their corresponding actuators.

9. In an accounting machine having a platen, type bars movable to andfrom printing position relative to said platen and actuators for eachtype bar shittable during each cycle of operation to and from positionsdetermined by calculating pinions and stops set by the typinginstrumentalities, lever means operatively connected to said type barsfor actuating same to and from printing position, means forming a partof said actuator for controlling movement of said lever means whilepermitting limited relative movement therebetween, means independent ofsaid actuator for latching said lever means against movement, means onsaid actuator for inactivating said latching means during a portion ofsaid relative movement of said actuator to release said lever formovement to positions controlled by said actuator, means constantlyurging said levers in the direction to raise the type bar to printingposition, other means for latching each of said levers against movementto raise the type bars to printing position, and means responsive toinstrumentalities other than the actuators for controlling said otherlatching means.

10. An accounting machine as claimed in claim 7 in which the operativeconnection between a lever and its corresponding actuator comprises anactuator a portion of which is formed with an elongate .slot therein anda lever having a portion located within the slot to permit 12 relativemovement by an amount determined by the length of the slot.

11. An accounting machine as claimed in claim 10 in which the length ofthe slot in which the portion of the lever is located for relativemovement is equivalent to the extent necessary for the actuation of eachover its greatest operating range independently of the other.

12. An accounting machine as claimed in claim 7 in which the latchingmechanism comprises a lever arm having a pawl extending from one edgeportion thereof and a notch in the lever for receiving the pawl inlatehing engagement, means on the lever arm extending in the path of theactuator whereby the lever arm is rocked in the direction to retract thepawl from the notch responsive to engagement with the actuator duringshifting movement beyond position for controlling raising movement ofthe corresponding type bar to beyond zero position, and means constantlyurging the lever arm in the opposite direction to position the pawl inthe notch of the type bar operating lever in normal position of adjustment.

13. An accounting machine as claimed in claim 9 in which the otherlatching means comprises a lever arm pivoted for rocking movement in thedirection toward and away from said type bar operating lever, meansconstantly urging the lever arm to rotate in the direction to bring anedge portion into operative engagement with said type bar operatinglever, and means forming a part or" said lever arm adapted to beoperated for rotating the lever arm about its pivot to retract the endportion from operative engagement with the type bar operating lever torelease same for normal movement.

14-. In an accounting machine, a platen, a plurality of type bars each.having a series of types and movable to advance its types selectively toand return them from printing position relative to the platen,calculating mechanism including a like plurality of reciprocable amountactuators, means to differentially arrest said actuators in theiradvancing movement from a normal position, an operating connectionbetween each type bar its corresponding calculator actuator to limit thetype-positioning movement of the respective type bars in accordance withthe positions of arrest of said actuators, Said operating connectionpermitting the calculator actuator to move to its position of maximumadvance independently of any type advancing movement of the type bar,cyclically operable drive means, means operated by said drive means in acycle of operation of the latter and having a portion to advance saidactuators from their normal position to their ditferential positions ofarrest in one part of said cycle and to return them to their normalposition in a subsequent part of said cycle, and another portion toadvance said type bars in said one part of said cycle in an initiallytrailing relation to said actuators to positions corresponding to thepositions of arrest of said actuators and to return said type bars totheir normal positions independently of said actuators in saidsubsequent part of said cycle.

15. ln an accounting machine, a platen, a plurality of type bars movableto transport their type to and from printing position relative to saidplaten, calculating mechanism including a like plurality of amountdiderentinl actuators each movable from a normal position to any of aseries of amount differential positions independentiy of itscorresponding type bar and each having means to limit type-positioningmovement of said type bar, means to arrest the ditlerential actuatorsselectively in amount difierential positions, means yieldingly urgingsaid diiiew ential actuators to move to differential position and meansyieldingly urging said type bars to move to printing po sition,cyclically operable drive means, restoring means normally holding saidactuators and said type bars in their normal positions and operable bysaid drive means in a cycle of operation thereof to permit movement ofsaid actuators to difierential positions determined by said arrestingmeans and to permit movement of said type bars to printing positions,latch means on a fixed element of the frame normally holding the typebars against movement to printing position, and means on each saidactuator operative during movement thereof independently of the typebars to operate said latch means to release said type bars for movementin response to said biasing means.

16. in an accounting machine, a platen, a plurality of type bars movableto transport their types to and from printing position relative to saidplaten, calculating mechanism including a like plurality of amountdifferential actuators movable from a normal position to any of a seriesof amount differential positions independently of the type bars and eachhaving means to limit type-positioning movement of a respective one ofsaid type bars to locate in printing position the type corresponding tothe amount diiferential position of the differential actuator, settabledifferential stop means to arrest said actuators in amount differentialpositions in amount-entering operations, totalizer pinions cooperableWith said differential actuators to receive amount entries therefrom inamount entering operations and to limit differential positioningmovement of said actuators in total-taking operations, cyclicallyoperable drive means having portions normally positioning saiddifferential actuators in their normal positions and yieldingly urgingsaid actuators to move to differential positions in a cycle of operationand portions normally holding said type bars With their types out ofprinting position and yieldingly urging said type bars to move toprinting positions during said cycle of operation, and individual meansnormally restraining each of said type bars against movement to printingposition, and means operative by each of said actuators in a portion ofits independent movement to differential position to disable therestraining means of a respective type bar and release said type bar formovement to printing position.

17. A machine of the character specified having a platen, a plurality oftype bars movable from a normal out-of-printing position to any of aseries of printing positions, a printing hammer normally in the path ofmovement of said type bars to their printing positions, calculatingmechanism including a like plurality of amount ditferential actuatorsmovable from a normal position to any of a series of amount difierentialpositions independently of movement of said type bars from their normalpositions and each having means to limit movement of a respective typebar to printing positions corresponding to the difierential positions ofthe difierential actuator, a cyclically operable operating meansincluding means to move said hammer out of the path of said type barsduring an initial part of a cycle of operation, and means to move saiddifferential actuators from normal position at least to a predeterminedone of their differential positions during said initial portion of saidcycle and to urge said type bars to move to corresponding printingpositions, and means normally holding said type bars in their normalpositions and operable by said actuators upon movement of said actuatorsto said predetermined position and movement of said hammer out of thepath of said type bars to release the corresponding type bars toprinting positions determined by the respective ditferential actuators.

18. In an accounting machine, a main frame, a platen, a plurality oftype bars movable from a normal out-ofprinting position to any of aseries of printing positions relative to the platen, an actuator foreach type bar, an operating member reciprocable in the frame,calculating mechanism including a like plurality of calculatingactuators movable from a normal position to any of a series of amountdifferential positions independently of movement of the type bars fromnormal, each having an abutment in the path of movement of a respectivetype bar actuator, spring means urging each calculator actuator tooperated position, spring means urging each type bar actuator to moveits type bar to printing position, latch means normally engaged with thetype bar actuators to hold them spaced from the calculating actuatorabutments with the type bars located in said out-of-printing position,latch release means on each calculating actuator operative upon movementof the calculator actuator beyond a predetermined amount differentialposition to free the associated type bar actuator for movement intocontact with the respective calculator actuator abutment whereby toposition its type bar in a printing position corresponding to theditterential position of the respective calculating actuator, means onsaid operating member normally holding said calculating actuators intheir normal positions and operative during movement of the operatingmember in one direction to permit movement of said calculating actuatorsto differential amount positions and upon movement of said operatingmember in the opposite direction to return the calculating actuators tonormal position, and said last-named means having portions normallyholding the type bar actuators in their normal positions and operatedupon movement of said operating member in said one direction to permitmovement of said type bar actuators into engagement with said abutmentsand, upon movement of said operating member in said opposite direction,to move the type bar actuators out of contact with the calculatoractuator abutrnents to their normal positions for re-engagement by thelatch means.

19. A machine of the character specified having a platen, a plurality oftype bars movable from a normal out-of-printing position to any of aseries of printing positions, a printing hammer normally in the path ofmovement of said type bars to their printing positions, calculatingmechanism including a like plurality of amount differential actuatorsmovable from a normal position to any of a series of amount diflerentialpositions independently of movement of said type bars from their normalpositions and each having means to limit movement of a respective typebar to printing positions corresponding to the differential positions ofthe difierential actuator, and a cyclically operable operating meansincluding means to move said hammer out of the path of said type barsduring an initial part of a cycle of operation, means normally holdingsaid dilferential actuators in their normal positions and acting duringsaid initial portion of said cycle to move said differential actuatorsfrom normal position at least to a predetermined one of theirdifferential positions and to urge said type bars to move tocorresponding printing positions, and means normally holding said typebars in their normal positions and acting during the immediatelyfollowing portion of said cycle after movement of said hammer out of thepath of said type bars to release the corresponding type bars toprinting positions determined by the respective differential actuators.

20. In an accounting machine, a main frame, a platen, adding type barseach having a series of types and movable from a normal non-printingposition when all of the types are out of printing position relative toplaten to place any of its types in printing position, typewriter typebars operable to effect printing strokes against said platen,calculating mechanism including calculating actuators each movable froma normal position to any of a series of amount difierential positionsand each having means to limit type positioning movement of a respectiveadding type bar in accordance with the amount differential position ofsaid calculating actuator, a type guide for the typewriter type barsnormally lying in the path of movement of the adding type bars toprinting position and movable to a position out of said path, a cyclingmechanism in the main frame for moving the type guide to the latterposition, to move the calculating actuators from their normal positionstoward differential positions and to urge the adding type bars to moveto printing position during an initial portion of a cycle of operation,and

l means to delay movement of the adding type bars to printing positionduring at least a portion of the movement of said calculating actuatorsto differential positions and until the type guide has been displacedfrom the path of movement of the type bars to printing position.

21. In a machine according to claim 16, means settable to hold'all ofsaid type bars against movement to printing position throughout movementof the amount diiferential actuators from normal position to amountdifferential positions and back to normal position in said cycle ofoperation of said drive means.

22. In an accounting machine, a main frame, a platen, adding type barsmovable from a normal non-printing .position to any of a seriesofprinting positions relative to said platen, a movable printing hammernormally in the path of movement of said type bars, calculatingmechanism including actuators corresponding to said type bars .and eachmovable independently of said type bars from a normal position to any ofa series of differential .positions and each having means to limitmovement of a respective type bar to printing positions corresponding ofthe differential positions of said actuator, means for urging said typebars from their position of rest to their position for printing,cyclically operable mechanism having portions for moving said actuatorsfrom normal position to differential position and against normalposition and to move said hammer from the path of said type bars duringan initial part of the movement of said actuators from normal andportions acting during a part of movement of said actuators subsequentto said initial part for releasing said type bars for movement toprinting positions at which they are arrested by said limit means andagain return said type bars to their normal positions.

23. In an accounting machine, a plural order series of differentialactuators controlled by the calculating mechanism mounted for shiftingmovement to at least zero position during each cycle of operation of themachine, a plural order printing mechanism comprising a single printinghammer and, for each order, an adding type printing element shiftablebetween normal position out of the path of the hammer to a position forprinting in the path of the hammer under control of the actuator ofcorresponding order, means urging said type printing element intoposition for printing, latching means operatively engaging said typeprinting element for holding same against movement from normal position,and means responsive to movement of the actuator beyond a predeterminedposition for rendering said latching means ineffective to release saidtype printing element for movement under control of the actuator intothe path of the hammer for printing, and a means operative during thecycle of operation for returning all said type printing elements tonormal position independently of the actuator and in advance of returnmovement thereof.

24. in an accounting machine, a plural order series of differentialactuators controlled by calculator mechanism for movement to at leastzero position and return during each cycle of operation of the machine,a plural order printing mechanism comprising a single printing hammerand, for each order, an adding type printing element shiftable into andout of the path of the hammer for printing, a bell crank lever pivotedintermediate its ends having one end opcratively engaging said typeprinting element for actuation into and out of printing position,

means to urge said bell crank lever for pivotal movement in thedirection to raise the type printing element to printing position,latching mechanism for holding said bell crank lever against pivotalmovement including a lever arm mounted for rocking movement, means onsaid lever arm for blocking rotational movement of said bell crank leverwhen in normal position of adjustment, means ur ing said lever arm inthe direction to position said means in blocking position, means on saidlever arm adapted to be engaged by the actuator upon movement beyondzero position for rocking said lever arm in the direction to l 5 rendersaid blocking means ineffective and release the bell crank lever forrotational movement.

25. An accounting machine having a plural order differential mechanismcomprising, for each order, a differential actuator operable from anormal position to any of a series of differential advanced positionsand again to normal position in a machine cycle, and a printingmechanism comprising a single printing hammer, means to impel saidhammer in a printing stroke, and, for each of said orders, a printingtype bar having a series of types thereon, said type bars being normallypositioned out of the path of said hammer, means to advance said typebars from said normalposition to positions in the path of said hammerdetermined by the difi'ferential actuators of corresponding orders toposition selected types at a printing line, and means for each type barnormally latching said type bar against movement into the path of saidhammer and operable by the actuator of corresponding order advancingfrom normal position to or beyond a predetermined one of said series-ofdifferential advanced positions to release the type barof the same orderfor movement intothe path of'the hammer.

'26. An accounting machinehaving a plural order differential mechanismcomprising a plurality of differential actuators operable from a normalposition to any of series of differential digital positions and again tonormal position in a machine cycle, and a plural order printingmechanism comprising a single printing hammer, means to impel saidhammer in a printing impact stroke, a plurality of printing type barseach having thereon a series of digit types including a 0 type, saidtype bars being normally positionedout of the .path of said hammer,means to advance said type bars from said normal position to positionsin the path of said hammer determined by the differentially positionedactuators to position selected types at aprinting line, andmeansncrmally latching said type bars against movement into the path ofsaid hammer and operableby any difierential actuators advancing fromnormal position to or beyond a differential digital position other thanthe 0 position to release the type bars of the same and all lower orderfor movement into the path of the hammer to place at the printing linetypes corresponding to the digital positions of the actuators ofcorresponding orders.

27. An accounting machine having a plural order differential mechanismcompn'sing a plurality of differential actuators operable from a normalposition to any of a series of differential digital positions includinga 0 position and again to normal position in a machine cycle, and aplural order printing mechanism comprising a single printing hammer,means to impel said hammer in a printing impact stroke, a plurality ofprinting type bars each having thereon a series o digit types includinga 0 type, said type bars being normally positioned out'of the path ofsaid hammer, means to advance said type bars from said normal positionto positions in the path of said hammer determined by said actuators toposition selected types at a priutin line, and, for each type bar, alatch means normally latching said type bar against movement into thepath of said hammer and operable by the actuator of the correspondingorder advancing from normal position to or beyond a predetermined one cfsaid differential positions other than the 0 position to release saidtype bar for movement into the path of the hammer to place at saidprinting line the digit type corresponding to the digital position ofsaid actuator, the latch devices for adjacent orders having meansoperative upon movement of the higher order latch device to releasingposition to move the lower order latch device to releasing position tofree the type bar of said lower order to move into the path of saidhammer and .position its 0 type at the printing line if said lower orderlatch device has not been released by the diiferential actuator of saidlower order.

28. .In a machine of the character specified, a. platen to supportrecord material at a printing line, a plural order printing mechanismincluding, for each order, a type carrier having a series of typesextending transversely of said printing line, an indexing deviceconnected with said type carrier, means normally positioning saidindexing device and type carrier with all of said types displaced fromsaid printing line and operable to move said indexing device and typecarrier to transport the types of said series successively to saidprinting line, a differential actuator movable independently of saidindexing device and type carrier from a normal position to any of aseries of advanced positions, means to arrest said actuator at selectedones of said advanced positions, said actuator having means to limitmovement of said indexing device and the connected type carrier toposition at the printing line that type of the series corresponding tothe arrested position of said actuator, and a latch device normallyengaging said indexing device and latching it and the connected typecarrier in normal position with all types thereon displaced from theprinting line but operable by said actuator upon movement of the latterfrom its normal position to or beyond a predetermined one of saidadvanced positions to release said indexing device and connected typecarrier for type indexing movement, each pair of adjacent latchingdevices having means acting upon movement of the higher order latchdevice of the pair of to move the lower order latch device to releasingposition if it has not been so moved by its associated differentialactuator.

References Cited in the file of this patent UNITED STATES PATENTS1,241,140 Nicholson Sept. 25, 1917 1,465,871 Schaller Aug. 21, 19231,533,119 Lasker Apr. 14, 1925 2,183,920 Rainey Dec. 19, 1939 2,340,261Eichler Jan. 25, 1944 2,357,571 Anderson Sept. 5, 1944 2,496,357 RaineyFeb. 7, 1950

